After web research, I gather that playing DVD movies on FC11-64 involves installing the current version of libdvdcss. (I don't understand if something that is "Blu-ray" has different issues, but I don't have anything in that format yet.)

I think libdvdcss can function as a "plugin" that is automatically detected by FC11's default movie player.

I'm less certain about the best way to get the current version of libdvdcss. Should I get it from the livna.org repository? That involves adding livna.org to my repositories.

Thank you stoat and marcblevins. I was able to get Mplayer to work and am watching the opening scenes of "It Happened At Nightmare Inn". ( $1 at Dollar Tree. I may not watch this movie all the way through.)

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